bumbl cryptomator is already in the repo, you can have a look at the package.yml if you want. Be warned that you won't be able to build newer versions because they require OpenJDK 10 or 11 which isn't in the repo at the moment.
Let me share some advises
- Start easy, instead of building a new package from scratch, try to update existing ones. This will allow you to check your environment is properly configured, get used to packaging and learn how to submit a patch
- Do not hesitate to ask for help if you get stuck on something, for quick questions join #Solus-Dev on IRC/Freenode
- Take time to read the doc and bookmark it for reference
- Choose something easy to start, even if it's not something you are interested in. Don't upload your package.yml on the dev tracker to ask if it's good. Submit the package and you'll get feedback. Don't worry if you get lot of remarks, it's normal at the beginning and it's part of the learning process. It will also give you the opportunity to learn how to update a patch that was already submitted for review
- Don't submit packages for which there is no approved package request
Then when you feel comfortable enough, if you want to contribute you can have a look at the pending requests waiting for a maintainer; this of course suppose that you will do a follow up of the package(s) you decide to maintain.
